I039 is a road sensing suspension problem, I042 is battery voltage too high. I would first try to clear the codes and try to figure out why the voltage is too high - often a faulty regulator in the generator.
You also seem to have a battery drain problem - something besides the keep-alive circuit is drawing it down. First check all lights (including trunk and under hood) and the rear air compressor when the car is turned off.
Road sensing problem could because of the high voltage, but could also be one of the height sensors at each wheel is detached or broken, or the RSS module has given up the ghost.
SOURCE: Engine races, misfires and stalls sometimes
oxygen sensor has this effect when it is busted.
SOURCE: diagnostic codes on '94 caddy deville
powertrain control module, controls engine and trans, by getting signals from info.sensors,
SOURCE: How Do I remove the door panels in my 94 cadillac deville concours?
u have to remove the panel that has the door handle in it, remove the panel which has the window and the seat adjusters, unplug the wires and just lift the door panel and there u are.
SOURCE: 2003 Cadillac Deville stalls while driving
Check your pending trouble codes, could be your crankshaft sensor b...
SOURCE: 2003 cadillac deville pcv valve location?
try www.autozone.com to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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